Arctic Air is hard to time… for humans and computers!

Cold arctic air is like pouring out a big bottle of molasses on the table. It starts out thick and slow, and as it thins out, it picks up speed and momentum.

The arctic air is very thick in the Northern Plains, and it normally moves fairly slowly and regularly, and fairly PREDICTABLY.

But as it continues to move south into Kansas and Oklahoma, often times it gets very thin, only a few thousand feet thick-at this point, it becomes very hard for the computers to accurately time, and it often accelerates southward (which is also downhill)

We got a tough reminder of that with this cold air mass, consistently timed out to arrive Sunday, but it speeds up and rolls in a day early!